20493563635 has 4 divisors (see below), whose sum is σ = 24592276368. Its totient is φ = 16394850904.

The previous prime is 20493563593. The next prime is 20493563659. The reversal of 20493563635 is 53636539402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20493563635 - 2⁷ = 20493563507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049356359 + ... + 2049356368.

It is an arithmetic number, because the mean of its divisors is an integer number (6148069092).

Almost surely, 2^20493563635 is an apocalyptic number.

20493563635 is a deficient number, since it is larger than the sum of its proper divisors (4098712733).

20493563635 is an equidigital number, since it uses as much as digits as its factorization.

20493563635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098712732.

The product of its (nonzero) digits is 1749600, while the sum is 46.

The spelling of 20493563635 in words is "twenty billion, four hundred ninety-three million, five hundred sixty-three thousand, six hundred thirty-five".